Koishitai nara Boku ja Dame?

That day, I learned the truth about his obsession... Iori's all-consuming fixation... and the kind of pleasure that melts you from the inside out. I'm Ritsu Hino, and my dream is simply to get a girlfriend! ...Except I've been striking out nonstop. One day, after yet another failed pickup, a guy claiming to be the brother of the girl who dumped me suddenly shows up. He says, "I want you to see her one more time," and I'm thinking, score! Or so I thought. But before I know it, he's saying, "I get jealous of every girl you talk to," while his hands start roaming all over me. I'm supposed to like girls, but when he whispers love into my ear and touches all the right spots, I can't fight the strange, addictive pleasure. Ever since that day, the heat in my body and the ache deep inside just won't stop. A twistedly devoted "girlfriend-face" seme × a short-tempered, easily flustered tsundere uke.

(Source: Shu-Cream, translated)